This makes it possible to stream data coming
from another server straight into the POST request to Gitlab,
saving an extra, expensive, and useless IO operation on disk.

Fix #769

A 'scope' attribute was added to the Events API that allows retrieval of all events for a user across all the projects that user has access to.  This change adds support for this new attribute.

Ensuring test SystemHooks are removed if tests fail, adding commentary/todo to address GitLab issue at future date

Remove UserListSerializer and UserListDeserializer from approvedBy field in ApprovalRule (fixes #589) (#590)